Personally I don't even know why she would admit this to a media outlet. Everyone knows how bad a place the sport is in, so for one of a nation's leading athletes to say this, is irresponsible on her part, even if she believes it. Think about the impact of what you say.
Yes if you are a casual/non-running viewer then 30mins can be a bit long but then what does that say about the Marathon? Plenty of people turn up to watch that. The dead-space is actually the lack of story lines in this, and while I and others can be critical of wave lights, it does help the casual fan. How do we solve this in marathons? Splits, decent commentary, info on athletes, etc
For the more hardcore track fans, even 5000's can be over relatively quick, I enjoy the 10,000m more than any other event because you get a good amount of sport to watch but also I personally understand just how much of a slog 25laps at a decent pace can be, let alone throwing rivals in there.
Keep the 10, make it more engaging; better coverage/commentary, better storylines, more accessible athletes, keep the wavelights, make them into proper events (like Nightof10000mPB's with music, entertainment, fireworks, etc) not just some extra long distance event that gets pegged onto the end of a full day of events. Make it EASY TO F-ING STREAM, not hidden behind some geo-locked paywall. Put in decent prize money to attract talent, heck have more of them so they are more commonly known about.
At a very basic level, people are only turning away from the 10000 because society in general now gets bored easy, wants quick results/validation and avoids harder work. Pull your pants up.